Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide as per Pharmacopia? Whether it means the formula for calculating molarity was wrong? 

5 Answers   Claris Otsuka, Ranbaxy,

---

I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

0 Answers  

---

HOW RRF IS CALCULATED IN HPLC

2 Answers  

---

what is the basis of separation in chromatography?

1 Answers   Anthem,

---

Which buffer is used for LC/MS mobile phase & at What Conc.

3 Answers  

---

What is descriminatory disolution medium ?

3 Answers   Cipla, Graviti Pharmaceuticals,

---

what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

0 Answers   DRL, Laurus,

---

What is the role of SO2,I2, Methanolic hydroxide and any base in Karlficher titration

2 Answers   Medley Pharmaceuticals,

---

why required specificity in valdation

3 Answers  

---

Why are use silicon oil mr?

0 Answers  

---

which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

0 Answers   Hetero,

---

what is use of acetonitrile compare to methanol in RP-HPLC Method devlopment

7 Answers   Neuland, Orchid,

---